Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 38770a1d7fb564d8…

MALICIOUS

Office (OOXML) / .XLSX

680.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-08-08
MD5: 93d65d182bdf8a2e9e5d38d1661f3bb7 SHA-1: 9e21b2b8f08cdaeb810c64762210687ecd1d84df SHA-256: 38770a1d7fb564d852c3f22d70f6e4cf3f24a0e5240f96ebf3d2c017af671618
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it's being used to exploit a vulnerability. The document body presents a fake purchase order, likely a lure to trick the user into opening the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/eTI.8gw contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
83d884f5dbb88b0c5309bbc5393bc1e990bddd0367b4e1cdb54814fed8c572ef		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/eTI.8gw 924672 bytes
ooxml_oleobject_00_ole10native_00.bin
66e5e4141d8a280e8d6dbcd35177abd2210a289a6908be6b67e0d274290a438f		 ole-package OOXML xl/embeddings/eTI.8gw Ole10Native stream: olE10NATive 914606 bytes

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